Here's how I do it.
Immediately run 30 degrees to the left of where you start, heading for some shrubbery near the edge of the treeline. A commie squad is going to walk along the ridge that will then be right ahead of you, and you should be able to kill them all. The LAW soldiers will advance over this ridge and hit the first Shilka, and will be in position to hit the BMP when it rolls through. Clean up everything in the first village, whatever it's called, and move on.
On the way to Chapoi, there are three commie squads. One is near the first village, usually moving along the shrubbery line that's on the left side of the road as you face Chapoi. You should be able to surprise and kill them all. The second is farther towards Chapoi, this time on the right side of the road. They may be in some trees by the time you get to them, and they almost always see you before you see them. One of them has an RPG, just in case you run out of LAW soldiers. The third is in or just beyond a thicket that will be between you and Chapoi when your squad goes for the third Shilka. They like to throw grenades, but that shouldn't mean anything. If you didn't run out of LAW soldiers, let them do the dirty work: wait by the thicket, and then the moment the Shilka goes cubist, sprint directly back toward the road. The rest of the squad may or may not follow directly, but they'll be heading that general direction too. Keep ahead of them and the commies will worry more about them than you. Once you reach the road, turn around and give whatever is left of your squad some fire support. They'll stop in bushes somewhere near the road that branches off and goes into Chapoi. Let the Cobras kill stuff for a while, and shoot anything that sticks its head up. When they're done, either because they've killed everything they see or because they've crashed - only once have I seen them crash before killing the tanks - move along the road, staying out of Chapoi. When you get far enough down it, a M113 will show up to relieve you. Keep your head down and let it do its business. With any luck, you'll still have some of your squad left, and can crawl through town to mop up anything that hasn't already come out to play the winner.